按 xml 文档按 child 元素分组

Question

我有以下xml。它是一组记录 parent 节点，包含标识符、数量和类别。

<Data>
<record>
    <identifier>1000</identifier>
    <category>B</category>
    <quantity>90.00</quantity>
</record>
<record>
    <identifier>1000</identifier>
    <category>B</category>
    <quantity>50.00</quantity>
</record>
<record>
    <identifier>1001</identifier>
    <category>B</category>
    <quantity>13.00</quantity>
</record>
<record>
    <identifier>1002</identifier>
    <category>B</category>
    <quantity>100.00</quantity>
</record>

我需要根据 child "identifier" 的记录元素进行分组。预期的输出是这样的。

<Data>
<records>
    <record>
        <identifier>1000</identifier>
        <category>B</category>
        <quantity>90.00</quantity>
    </record>
    <record>
        <identifier>1000</identifier>
        <category>B</category>
        <quantity>50.00</quantity>
    </record>
</records>
<records>
    <record>
        <identifier>1001</identifier>
        <category>B</category>
        <quantity>13.00</quantity>
    </record>
</records>
<records>
    <record>
        <identifier>1002</identifier>
        <category>B</category>
        <quantity>100.00</quantity>
    </record>
</records>

我正在使用这个 xslt，但它在分组级别都不起作用。

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
<xsl:output method="xml" indent="yes" encoding="UTF-8" omit-xml-declaration="yes" />
<xsl:template match="Data">
    <Data>
        <xsl:for-each-group select="record" group-by="identifier">
            <records>
                <xsl:for-each select="current-group()">
                    <xsl:copy>
                        <xsl:value-of select="*" />
                    </xsl:copy>
                </xsl:for-each>
            </records>
        </xsl:for-each-group>
    </Data>
</xsl:template>

我怎样才能修复它以使其正常工作？

Answer 1

您显示的结果可以通过稍微调整（并简化）您的样式表来实现：

XSLT 2.0

<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:output method="xml" indent="yes" encoding="UTF-8" omit-xml-declaration="yes" />
<xsl:strip-space elements="*"/>

<xsl:template match="/Data">
    <Data>
        <xsl:for-each-group select="record" group-by="identifier">
            <records>
                <xsl:copy-of select="current-group()" />
            </records>
        </xsl:for-each-group>
    </Data>
</xsl:template>

</xsl:stylesheet>

演示：https://xsltfiddle.liberty-development.net/ncnu9B8/1

按 xml 文档按 child 元素分组

group by xml document by child element

xml

xslt

xslt-2.0

xslt-grouping